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12x+2(2x)+3(x-1)=57.8
We move all terms to the left:
12x+2(2x)+3(x-1)-(57.8)=0
We add all the numbers together, and all the variables
34x+3(x-1)-57.8=0
We multiply parentheses
34x+3x-3-57.8=0
We add all the numbers together, and all the variables
37x-60.8=0
We move all terms containing x to the left, all other terms to the right
37x=60.8
x=60.8/37
x=1+13.2222222222/20.5555555556
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